Rebody Replica veglia speedo gauge. A couple of questions..

[Pingu]

I don't think you fried your speedo, as Veglia-man said it was OK.

The speedo is not designed to be used with the Z3 cluster connected. You can piggy-back inputs to the cluster and earths from the cluster, but you must not use any of the outputs.

The following are outputs...

X16 (White connector)
11 WS/GE (Diagnostics)
12 WS/VI (Diagnostics)

X17 (Blue connector)
2 SW/WS (Speedometer A-signal)
9 SW/RT Acoustic output / Acoustic warning signal

X271 (Black connector)
1 BR/GE Fuel tank sensor / Fuel level sensor
3 BR/SW Fuel tank sensor, position signal generator (reed contact)


I think I may have found your problem. If you have BR/SW from the diff connected to your Z3 cluster, cut the wire, and connect it directly to ground. This wire should ONLY go to ground.

If it is connected to the Z3 cluster, it will go to ground via the internal circuitry of the Z3 cluster. This is where your "noise" is coming from.

 

[Pond]

I don't think you fried your speedo, as Veglia-man said it was OK.

The speedo is not designed to be used with the Z3 cluster connected. You can piggy-back inputs to the cluster and earths from the cluster, but you must not use any of the outputs.

The following are outputs...

X16 (White connector)
11 WS/GE (Diagnostics)
12 WS/VI (Diagnostics)

X17 (Blue connector)
2 SW/WS (Speedometer A-signal)
9 SW/RT Acoustic output / Acoustic warning signal

X271 (Black connector)
1 BR/GE Fuel tank sensor / Fuel level sensor
3 BR/SW Fuel tank sensor, position signal generator (reed contact)


I think I may have found your problem. If you have BR/SW from the diff connected to your Z3 cluster, cut the wire, and connect it directly to ground. This wire should ONLY go to ground.

If it is connected to the Z3 cluster, it will go to ground via the internal circuitry of the Z3 cluster. This is where your "noise" is coming from.

I did have the brown/black from the diff sensor connected to the cluster originally. Then it stopped working, so I have (at present) the brown/red from the diff sensor connected to the red/blue on the speedo (input 2) and the brown/black connected directly to earth on an unused post. And it still doesn't work. It still does exactly the same things as it did before I changed the wiring.

ETB say that you can use the output speed signal from the cluster (black/white) but it needs to go to the yellow (input 1) on the speedo. As I said above that is how I originally had it wired, but I was using red/blue (input 2), not 1 on the speedo.

 

[Pond]

As it stands at present, the only things connected via the cluster to the speedo are the three warning lights within the speedo.

There are other lights connected to the cluster (both foglights' telltales, the DSC warning and the ABS warning) but these are purely extended from the cluster to the new lights' locations. The direction indicator and high beam bulbs are also taken from the cluster but these go to the tacho. This and all bulbs work correctly.

I have ten bulbs connected via the cluster in total (including their earths), that is it. Nothing else. All work as they should.

 

[Pingu]

... and the brown/black connected directly to earth on an unused post.

I don't think it will make any difference, but connect BR/SW to the same earth as the SW (Pin 5) from the speedo head is connected.

 

[Pond]

I don't think it will make any difference, but connect BR/SW to the same earth as the SW (Pin 5) from the speedo head is connected.

I am going to firstly connect the speed sensor earth to the fuel gauge earth, as this is how BMW did it. If that doesn't work, I will connect the sensor earth to my gauges earth.

I have disconnected the radio aerial and power to the aerial amplifier just in case (the signal was crap anyway, so not lost anything).

I have a list of things to change/ disconnect, try on the road, then try something else.

I need to get on with it, as the interior of my car being in bits again is depressing me!

 

[Pond]

Update on this, for anyone still interested.
My speedometer is now working (touch wood). To be honest I still don't know what was wrong. All I have done since it came back from ETB is moved the earth for the speed sensor to a common post for all other dashboard-related earths and removed the radio aerial at both ends including the wire which goes to the aerial amplifier.

I did also disconnect the three internal warning lights within the instrument as a precaution but have since re-connected them and it still works as it should.

I have now got to put the interior and dash back together, so hope it stays working after this!